If the cluster where the rgw is started is secondary and not primary,
trying to create the admin ops user will fail with:
```
Please run the command on master zone.
Performing this operation on non-master zone
leads to inconsistent metadata between zones
```
So we need to force the creation regardless, it is fine the creation will
return UserAlreadyExist and then we just read the current user.
Closes: https://github.com/rook/rook/issues/8671
Signed-off-by: Sébastien Han <seb@redhat.com>